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Check assembly dependency versions before loading in WinPS #1561

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19 changes: 17 additions & 2 deletions src/PowerShellEditorServices.Hosting/EditorServicesLoader.cs
Original file line number Diff line number Diff line change
Expand Up @@ -131,15 +131,15 @@ public static EditorServicesLoader Create(

// First look for the required assembly in the .NET Framework DLL dir
string baseDirAsmPath = Path.Combine(s_psesBaseDirPath, dllName);
if (File.Exists(baseDirAsmPath))
if (RequiredAssemblyExists(baseDirAsmPath, asmName))
{
logger.Log(PsesLogLevel.Diagnostic, $"Loading {args.Name} from PSES base dir into LoadFile context");
return Assembly.LoadFile(baseDirAsmPath);
}

// Then look in the shared .NET Standard directory
string asmPath = Path.Combine(s_psesDependencyDirPath, dllName);
if (File.Exists(asmPath))
if (RequiredAssemblyExists(asmPath, asmName))
{
logger.Log(PsesLogLevel.Diagnostic, $"Loading {args.Name} from PSES dependency dir into LoadFile context");
return Assembly.LoadFile(asmPath);
Expand Down Expand Up @@ -394,5 +394,20 @@ private static object GetPSVersion()
.GetMethod("get_PSVersion", BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic)
.Invoke(null, new object[0] /* Cannot use Array.Empty, since it must work in net452 */);
}

private static bool RequiredAssemblyExists(string assemblyPath, AssemblyName requiredAssembly)
{
try
{
AssemblyName foundAsm = AssemblyName.GetAssemblyName(assemblyPath);
return foundAsm.Equals(requiredAssembly);
}
catch
{
// Do nothing
}

return false;
}
}
}